Conclusion
The MAX1820 successfully meets the quality and reliability standards required of all Maxim products. In addition,
Maxim’s continuous reliability monitoring program ensures that all outgoing product will continue to meet Maxim’s quality
and reliability standards.
Table of Contents
I. ........Device Description V. ........Quality Assurance Information
II. ........Manufacturing Information VI. .......Reliability Evaluation
III. .......Packaging Information
IV. .......Die Information ......Attachments
I. Device Description
A. General
The MAX1820 low-dropout, pulse-width-modulated (PWM) DC-DC buck regulator is optimized to provide power to the
power amplifier (PA) in WCDMA cell phones; however, it may be applied in many other applications where high
efficiency is a priority. The supply voltage range is from 2.6V to 5.5V, and the guaranteed output current is 600mA;
1MHz PWM switching allows for small external components, while skip mode reduces quiescent current to 180µA
with light loads.
The MAX1820 is dynamically controlled to provide varying output voltages from 0.4V to 3.4V. The circuit is designed
such that the output voltage settles in <30µs for a full-scale change in voltage and current.
The MAX1820 includes a low on-resistance internal MOSFET switch and synchronous rectifier to maximize
efficiency and minimize external component count; 100% duty-cycle operation allows for low dropout of only 150mV
at 600mA load, including the external inductor resistance. The device is offered in 10-pin µMAX and tiny 3 x 4 chip-
scale (UCSP™) packages
B. Absolute Maximum Ratings
Item Rating
BATT, OUT (FB), SHDN, SYNC, SKIP, REF to GND -0.3V to +6.0V
PGND to GND -0.3V to +0.3V
LX, COMP to GND -0.3V to (VBATT + 0.3V)
Output Short-Circuit Duration Infinite
Operating Temperature Range -40°C to +85°C
Junction Temperature +150°C
Storage Temperature Ranges -65°C to +150°C
Lead Temperature (soldering, 10s) +300°C
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX 444mW
Derates above +70°C
10-Pin µMAX 5.6mW/°C
